Skiving machine



g- 1942- s.v w. POTTER ETAL SKIVING MACHINE Filed Feb. 20, 1941 4 Sheets-Sheet l Aug. 4, 1942. s. w. POTTER ETAL 2,291,757

SKIVING MACHINE Filed Feb. 20, 1941 4 Sheets-Sheet 2 Aug- 4, 1942. s. w. POTTER ET'AL SKIVING MACHINE Filed Feb. 20, 1941 4 Sheets-Sheet 3 Aug? 4, 1942- s. w. POTTER EI'AL 2,291,757

SKIVING MACHINE Filed Feb. 20, 1941 4 Sheets-Sheet; 4

FigZ

Patented Aug. 4, 1942 SKIVING -MACHINE Sydney White Potter,

Leicester, and Joseph Harold Perkins, Kettering, England, assignors to United Shoe Machinery Corporation, Borough of 'Flemington, N..J., a-corporationof New J crsey Application February 20, 1941, Serial No. 379,866 'In Great Britain February 29, 1940 14 Claims.

This invention relates to skiving machines and is herein set forth-as embodied in amachine for ski-ving pieces of sheet material used in the manufacture-ofboots and shoes.

One type of such a machine comprises a boxlike frame, a tubular knife the upper edge of which projects slightly above the top of the frame, and a feed roll which is located partly within the knife and is mounted in an end-portion of the frame, said end-portion being pivoted about a vertical stud at the rear of the frame and being adapted to be swung from closed to open position to give access to the knife.

It is desirable that the knife be at rest when the end-portion -is open, and, according to one feature of the invention, power can be applied to the knife to rotate it only when the end-portion isinclosed position. In the illustrated machine the means for applying power includes a belt shifter, the construction being such that the end-portion cannot be opened when the belt shifter is in position to apply power to rotate the knife; and, when the end-portion is open, the belt-shifter cannot be moved into power-applying position.

This and other features of the invention, including certain details of construction and combinations of parts, will be described as embodied in an illustrated machine and pointed out in the appended claims.

Referring now to the accompanying drawings,

Fig. 1 is a plan view of the illustrated machine;

Fig. 2 is a right-hand side elevation of the machine, the overhanging arm having been omitted;

Fig. 3 is a front elevation, partly in section, showing some of the :parts which are shown in Fig. l at the rear of the machine;

Fig. 4 is a left-hand side elevation, partly in section, of the machine;

Fig. 5 is a left-hand .side elevation, partly in section, showing certain mechanism at the rear of the machine;

Fig. 6 is a front elevation, partly in section, showing the tubular skivingiknife and work supporting and feeding mechanism of the machine;

Fig. 7 is a side elevation showing the work supporting and feeding mechanism shown in Fig. 6 viewed in the direction indicated by the arrow VII in Fig.6; and

Fig. 8 is a section on the line VIII-VIII in Fig. '7.

The illustrated machine comprises a box-like frame I (similar to the frame referred to in '3 about six inches in diameter.

ritish Patent No. 318,290) adapted to be secured on the top of a work bench. The frame I has rotatably mounted withinit a cylindrical knife The knife is secured on the left-hand end of a horizontal shaft extending laterally of the machine which is rotatably mounted in a bearing sleeve 5 which is slidably mounted in a bearing 1 on the inside of a front wall of the frame I. 'As the knife wears or is ground away the sleeve 5 and knife 3 may be adjusted towards the left by means of a hand-wheel 9 (Fig. 1') at "the front of the frame. The hand wheel 9 is secured on a horizontal rearwardly extending spindle, rotatably mounted in the frame, said spindle having on its rear end a Worm l3 meshing with a worm wheel II secured on a spindle l3 rotatably mounted in the frame, said spindle l3 having secured on it a gear wheel which meshes with rack teeth l5 on the sleeve 5. The sleeev 5 and knife are locked in adjusted position by a looking bolt operated by a hand lever also at the front of theinachine.

The right-hand end of the knife shaft has secured on it a crosshead I! which has projecting from its right-hand side two horizontal pins 19 one at each side of the axis of the knife shaft. The latter pins enter recesses formed in a second scrosshead 2! which is secured on the left-hand end of a driving shaft 23 which is rotatably mounted in the frame and is coaxial with the knife shaft. The crossheads and pins cause the knife shaft to be driven by the driving shaft and allow the knife shaft and knife to be adjusted axially.

The driving shaft 23 has secured on its righthand end a pulley 25 (Fig. 1) around which passes a flat belt '21. The belt 21 also passes around a pulley 23 secured on a horizontal countershaft 3| at the rear of the machine. vThe countershaft 3| is positioned about sixteen inches rearward of the driving shaft 23 and is rotatably mounted in a countershaft bracket 33 secured on the work bench. The forward end of the countershaft bracket 33 is pivotally connected to the rear of the frame I by a horizontal shaft 35 (Fig. 5) ex-. tending laterally cf the machine which passes through lugs on the bracket 33 and frame I. If, therefore, the frame I is unfastened from the work bench the frame may be swung up about the axis of the shaft 35, without disturbing the countershaft bracket 33, to enable the operator to obtain access to parts of the machine within the frame. The countershaft 3| is rotatably mounted in bearings 31, 39 on the countershaft 29, and the right-hand side of this pulley 29 and the pulley 25 on the right-hand end of the driving shaft 23 are unobstructed so that the belt 21 may be removed without disturbing any parts of the machine other than a guard plate 4! which is pivoted to the frame I by a rod 43 at the right of the pulleys.

The knife 3 is usually rotated in a counterclockwise direction viewed from the left of Fig. 1, i. e. the upper or work-engaging portion of the knife travels rearwardly of the machine, and the friction between the knife and the work tends to hold the edge of the work which is being skived against a fixed edge gauge of the machine positioned at the rear of the work and close to the knife edge.

If the concave edge of a workpiece, e. g. the inner edge of a skeleton heel lift Or horse-shoe shaped rand, which consists of a substantially U-shaped strip of material, is to be skived along its inner edge an edge gauge lying substantially above the centre of the knife is used, and the inner edge of the skeleton lift, i. e. the edge which will be thinned, is guided by the rear edge of the edge gauge, the edge gauge therefore being within the U-shaped strip. With such an arrangement only the Width of the strip extends rearward of the edge gauge the greater part of the strip being in front of the edge gauge. There is therefore little if any likelihood of such a workpiece coming into engagement with any part of the machine and being deflected thereby out of its correct path in relation to the edge gauge and knife and being spoilt. If the knife were rotated in the usual direction aforesaid the friction between the knife and the workpiece would tend to move the workpiece rearwardly away from the edge gauge. When such workpieces are to be operated upon the knife is driven in a clockwise direction when viewed from the left, i. e. its upper work-engaging portion moves forwardly of the machine, and the friction between the knife and the work tends to hold the edge of the workpiece against the edge gauge. The combined action of Work-engaging rolls, hereinafter described, and the knife in holding the work against the edge gauge tends to control the work in such a manner that the operator is relieved, or substantially relieved, from guiding the work as it is fed to the knife. The operator therefore has in many cases merely to present the work to the machine, and the work is automatically fed past the knife and skived, and another workpiece may be quickly fed to the machine.

The direction of rotation of the knife may be quickly changed by swinging upwardly the guard plate 4| and changing the belt 21 which connects the countershaft to the driving shaft for a crossed or open belt as the case may be.

The counter shaft 3| has mounted on it near its left-hand end and between the bearings 31, 39 on the countershaft bracket, fast and loose pulleys 45, 41 around which is arranged to pass a driving belt 48 (Fig.5) which is driven from a line shaft or a belt which is driven from a shaft beneath the bench.

The counter shaft 3| has secured on it a further pulley 49 which is positioned between the right-hand bearing 39 and the pulley 29 on the right-hand end of the countershaft. A belt 5| passes around this pulley and around guide pulleys 53, 55 and corresponds to the belt referred to as the belt 5 in British Patent No. 318,290

bracket 33 which are at the left of the pulley and drives the presser and feed rolls 51, 59 (Fig. 6) and a knife-grinding wheel of the machine. The illustrative machine, like that of th British patent, includes a two-speed driving mechanism by which the rolls 51, 59 are driven. Since this mechanism forms no part of the present invention and is substantially like that of the British patent it will not be further described except to note that the two-speed mechanism includes the pulleys 6|, 63 (Fig. 3).

The machine has a coverplate 65 (Fig. l) which extends over the driving shaft. The top of the coverplate is level with the top of the frame I and provides a large surface on which workpieces may be supported. The coverplate 65 extends from the front of the machine at the right thereof rearward and part way along the back of the machine and is held in position by screws 97 (Fig. 2), extending through open-ended slots in lugs on the coverplate which are threaded into the frame. The coverplate 65 can easily be removed by slackening the screws 5'! and lifting it from the machine. The coverplate 65 has extending around its outer side and rear edge an upstanding wall 69 which prevents workpieces on the coverplate from falling off. At the front of the machine the pulley 25 on the driving shaft is guarded by a guard plate 19 (Fig. 1) which extends upwardly from a bracket 12 secured to the front of the machine. The top of the guard plate engages the lower face of the coverplate.

A tool box H is secured on the top of the bracket 33 and serves to cover the pulleys 29, 49

and belts 25, 5| where they pass around the pulleys. The tool box H has a lid 13 pivoted to it.

The illustrative machine is provided with a cover 15 (Fig. 3) for the belt 5| and pulleys BI and 53 at the rear of the machine. The cover 15 is arranged, when closed against the rear of the machine, to enclose as far as possible the belt and pulleys and is pivoted on a vertical stud Tl (Fig. ,l) in the countershaft bracket so that it may be swung rearwardly to expose the belt and pulleys.

The machine also has the usual hinged endportion 19, which carries the feed roll 59. This end portion is swung toward the rear about a vertical pivot to open position to expose the knife. The machine is provided with means for preventing the cover 15 and the hinged end-portion 19 from being opened while the machine is running and means is also provided for preventing the machine from being started while the cover 75 and hinged end-portion 19 are open. The means for preventing the cover 15 and hinged end-portion 19 from being opened is controlled by a belt shifting device which moves the driving belt 43 (Fig. 5) from the fast to the loose pulley and vice versa.

The belt shifting device comprises a horizontal forwardly and rearwardly extending shaft.8l (Fig. l) which is rotatably mounted in a bearing on the bracket 12 and a bearing in the countershaft bracket 33. The shaft 8! lies at the right of the machine outside the guard plate 4| and has secured on its forward end a small hand lever 83 by which the shaft 8! may be rotated. The shaft 8! has secured on its rear end an arm 85 pivotally connected to a link 8'! which extends to the left and at its left-hand end is pivotally connected to a horizontal belt shifter bar 89 extending laterally of the machine, said bar being slidingly mounted in the countershaft bracket 33.

The belt shifter bar -89 has secured to :it a fork M which engages opposite sides of the 'belt and moves it from one pulley to the other. Partial rotation of the hand lever 89 in a clockwise direction causes the belt to be moved from the loose pulley 41 on to the fast pulley 45 and partial rotation of the hand lever in the opposite direction causes the belt to be moved from the fast to the loose pulley.

The belt shifter bar 89 has extending from it near its left-hand end a pin 93 which engages in an open-ended slot formed in the rear end of a horizontal lever 95 which, about mid-way between its ends, is pivoted on a vertical .stud 91 secured in the countershaft bracket 33. The forward end of the lever 95 has pivotally connected to it the right-hand end of a rod 99. The rod 99 extends towards the left from the lever and vat its left-hand end is pivotally connected to one arm IHI of a safety lever I93 which is pivotally mounted on a horizontal stud I95 extending from the rear of the machine frame. The safety lever I93 has an arm I91 which extends to the left.

The arm I91 (Fig. 3) has on its left-hand end an arcuate face I99 which when the belt shifter is moved towards the right to move the belt on to the fast pulley and cause the machine to be driven is moved up into a position in which an arm I I I extending rearwardly from the aforesaid hinged end-portion I9 of the frame would immediately engage it if it were attempted to swing the hinged end-portion from its closed position. The hinged end-portion cannot therefore be opened and theknife edge exposed while the machine is running. Also when the belt shifter has caused the belt to be moved on to thefast pulley the arm I-9I of the safety lever is moved into such a position that 2. lug I I3 on the rear face of the cover 75 would engage the arm IBI immediately upon movement of the cover rearward'ly and thus the cover is prevented from being swung rearwardly out of its closed position while the machine is running.

When the driving belt '48 is moved from the fast to the loose pulley the arm IB'I of the safety lever I93 is moved into a position just below the path of movement of the arm I'I'I on the hinged end-portion I9 and if the hinged end-portion is swung open its arm II'I overlies the arm I91 on the safety lever and prevents it from being swung upwardly far enough to allow the belt to be moved from the loose pulley on to the fast pulley. The driving belt therefore cannot be moved from the loose pulley to the fast pulley and the machine be driven while the hinged end-portion is open. Further when the cover E is open the lug II3 on the cover is in such a position that if the operator attempts to move the driving .belt from the loose pulley to the fast pulley the arm 'IOI of the safety lever I93 immediately engages the lug and such movement of the belt is prevented. The machine cannot therefore be driven while the cover is open.

It will be appreciated that when the machine is being driven neither the cover I5 nor the hinged end-portion I9, can be opened and that when either of these is open the machine cannot be started and therefore the operator is safeguarded against accident by the rotating knife or movin belt 5i which drives the feed rolls and grinding wheel.

The lower or feed roll 59 of the illustrative machine is similar to and is supported in the same manner as the roll referred to as the feed roll 11 in U. S. Letters Patent No. 1,782,495

granted upon an application filed in the names of Reginald B. Woodcock and Joshua Gook. The feed roll 59 can yield bodily downwardly about a horizontal axis extending forwardly and rearwardly of the machine parallel to the plane of the knife edge and can tip downwardly yieldingly about an axis at right angles thereto. The feed roll 59 is arranged to yield downwardly both bodily and angularly first against a comparatively light spring and then against a second spring in addition to the light spring which may be a stronger spring. This roll is keyed on a sleeve, similar to the sleeve referred to as the sleeve I8 in the U. 'S. patent, which is rotatably mounted on a stud H5, similar to the stud referred to as the stud 1-9 in said patent, said stud being fixed in a roll-carrying member "I H. The sleeve and feed roll are driven by a shaft similar to the shaft referred to as the shaft 3-! in the British patent through connections including a small shaft H8. The roll-carrying member II! has extending to the left from it a stud .I I9, which is rotatably mounted in a swinging frame I21. The swinging frame IZI is pivoted on a horizontal shaft 23 extending forwardly and rearwardly of the machine parallel to the plane of the knife edge, which is secured in the hinged end-portion E9. The swinging frame 'I2I has a depending arm I25 which is engaged by 'a spring plunger I21 mounted in the left-hand side of the hinged end-portion i9. The spring plunger 521 is backed by a comparatively light spring I29 and holds an adjustable screw I3! in the swinging frame up against the under side of the top of the hinged end-portion 19. Also mounted in the lefthand Side of the hinged end-portion 19 below the plunger i2! is a second plunger I33 which is engaged by the depending arm I25 of the swinging frame 12!. The spring plunger IE3. is slidingly mounted in a horizontal sleeve 835 which is threaded into a bore in a boss l3? on the lefthand side of the hinged end-portion. The -lefthand end of the plunger E33 has on it a head which is pressed by a compression spring I39, engaging the head, against a shoulder in a bore in the sleeve in which the spring I39 and plunger I33 are mounted. An adjustable sleeve I4I is threaded into the left-hand end of the sleeve E35 and engages the left-hand end of the spring I39. By means of the sleeve MI the spring I39 may be adjusted. The sleeve 535 has on its left-hand end a knurled flange I 53 by which the sleeve and with it the plunger E33 may be adjusted towards or from the depending arm E25. has threaded on it, between the boss I31 and the knurled flange Mfiian adjustable collar I45 which maybe secured by a set screw I i'i to the sleeve. When the sleeve I35 has been adjusted the collar I45 may be screwed up against the boss I31 to lock the sleeve in adjusted position and if the collar is then secured on the sleeve the sleeve may be adjusted outwardly if desired and returned to its original position by screwing it inwardly again until the collar engages the boss.

The roll-carrying member H? has connected to it below the pivot H9 one end of a comparatively light tensicn spring Hi9 which at its rear end is connected to a hook I5l in the rear wall of the hingedv end-portion 19. The tension spring m9 holds an adjustable screw I53 in the rollcarrying member ill against the under side of the top of the hinged end portion I9. Below the tension spring M9 the roll-carrying member II! has extending laterally from it a pin I55 on which is pivoted the forward end of a rear- The sleeve I35 7 wardly extending rod I51.

The rod I51 extends through an opening in the rear wall of the hinged end-portion 19. The rear end of the rod is slidingly mounted in a tube I59 at the rear of said portion 19, and the rear end of the rod is screw threaded. The rear end portion of the tube I59 has mounted on it a sleeve-like member I6I which has screw-threaded tightly into it a plug I63 so that the sleeve-like member I6I and plug I63 form in effect one part. The plug I63 is screw-threaded on the rear end portion of the rod I51 and the plug has on it a knurled flange I65 by which the sleeve-like member and plug may be rotated to adjust them along the rod. The rear end portion of the tube I59 passes through a bore, in which it is a sliding fit, in the front end portion in the sleeve-like member I5I. Rearward of the bore in the front end portion of the sleeve-like member I 6| is a larger bore in which is received a flange I61 formed on the rear end portion of the tube I59, and the aforesaid plug I63 is screwed into the rear end portion of the larger bore in the sleevelike member I6I. A compression spring I69 surrounding the tube I59 engages the front end face of the sleeve-like member IN and the rear face of a collar I1I having screw-threaded engagement with the tube and holds the front face of the flange I61 against a face in the sleevelike member I6I at the front end of the larger bore in the latter member, there being a gap between the rear end face of the tube in the sleevelike member and the forward end of the plug I63. The forward end face of the tube I59 is rounded and is arranged to engage in a rounded recess in the rear wall of the hinged end-portion 19 which surrounds the opening through which the rod I51 passes. The rounded end of the tube and recess allow the tube I59 and rod I51 to tip somewhat when the roll-carrying member II1 swings downwardly. The roll-carrying member H1 is normally held in its raised position by the aforesaid light spring I49 and when the roll-carrying member H1 is in this position there is a gap between the forward end of the aforesaid tube and the bottom of the recess in the hinged end-portion. As the feed roll and the roll-carrying member are moved down about the axis of the stud II9, i. e. the roll is tipped downwardly, the downward movement is resisted first by the light spring I 49 until the aforesaid gap between the forward end of the tube I59 and the bottom of the recess in the hinged end-portion 19 is taken up. After the gap is taken up, the feed roll moves down against the resistance of both the light spring I49 and the spring I69 on the tube which may be a stronger spring. When the feed roll is being moved down against the resistance of both springs the rod I51 moves forwardly and the sleeve-like member I6I and plug I63 move with it and since the tube is in engagement with the hinged end-portion 19 the spring I69 is compressed, the plug I63 moving towards the rear end of the tube along the aforesaid gap between them. The spring may be adjusted by adjusting the collar I1I along the tube, and the gap between the forward end of the tube and the hinged end-portion may be adjusted by rotating the sleeve-like member I6I and plug I63 on the rod, the tube I59, collar HI and spring I69 being caused to rotate with them by a pin I13 in the sleeve-like member I6I which engages in a recess in the flange I61 on the tube.

With the above-described arrangement whereby the feed roll 59 is caused to first move down both bodily and angularly against first a light spring and then another spring, a comparatively thick workpiece, which requires to be held up against the presser roll 51 under a comparatively strong spring, may be more easily presented to the machine than if the feed roll were supported merely by comparatively strong springs, since the aforesaid plunger I33 and tube I59 may be so adjusted that when such a workpiece is presented to the machine the feed roll will first yield downwardly against the comparatively light springs and then the stronger springs will come into action and hold the work up against the presser roll.

Further it is sometimes desired, after a workpiece has been skived by the machine, to present the same workpiece to the machine a second time to remove some more material from the already skived margin of the workpiece if the first skiving operation has not skived the workpiece as thin as is desired. The already skived margin only requires to be held against the presser roll under a comparatively light pressure and, since the margin has already been thinned down, the second springs do not come into action and the feed roll is only urged against the work by the comparatively light springs. Such an arrangement also enables comparatively thin or thick work to be presented to the machine and to be operated upon without adjustment of the springs which support the feed roll. If the sleeve I35 is adjusted so far to the right that the plunger I33 engages the depending arm I25 of the swinging frame IZI and the aforesaid tube I59 is adjusted so far forwardly that there is no gap between the front end of the tube and the hinged end-portion 19 then downward movement of the feed roll will be resisted by both the comparatively light and heavy springs.

The feed roll 59 has formedaround it teeth to grip the work and near one end a groove in which is mounted a spring finger I13 (Fig. 8) which is pivoted on the aforesaid roll-carrying member I I1. The upper face of the spring finger conforms to the cylindrical toothed face of the roll and when the roll is in its raised position the upper face of the spring finger is level with the top of the roll. If the margin of a work piece which has already been skived is again presented to the machine to be again skived the spring finger supports the thin edge portion of the margin and prevents this thin portion from being drawn down below the knife edge and the margin, as a result, being cut through by the knife.

The roll-carrying member I I 1 has a depending arm I 8| which has adjustably mounted in it a forwardly and rearwardly extending screw I83. The screw may be so adjusted that its forward end engages the rear face of the depending arm I25 of the swinging frame I2I and prevents angular downward tipping movement of the lower feed roll. With the screw I83 so adjusted the feed roll 59 can only move down bodily, and this arrangement ensures that the margin of the workpiece near its edge is gripped between the feed roll and the presser roll and finger. The gripping of the margin of the workpiece near its edge by the feed rolls greatly facilitates the turning of the work-piece when skiving around corners or curved portions thereof and actually, in conjunction with the edge gauge, turns or, at any rate, tends to turn the workpiece.

The presser roll 51 is supported at the lowerend of an overhanging arm and is mounted in a block I85 which may be adjusted both heightwise and angularly in any suitable manner, for

example as in the machine of Patent No. 1,782,-

mounted in the aforesaid block I85 but this portion does not pass rearwardly through the block. Rearward of this portion the spindle is reduced in diameter as shown at I93 (Fig. '7) and is received in a bore in a driving member I which has its front portion rotatably mounted in the same bore in the block I85 as the said portion of the spindle, the front portion of the driving member and the said portion of the spindle being of the same diameter and being connected, so that the driving member E95 drives the spindle IQI, by a tongue on one member and a groove on the other. The rear end of the driving member beyondthe block is enlarged and is arranged to receive the forward end of a small shaft I97, by which it is driven. The spindle has formed on it a rear part I99 of the roll, and the forward portion of the spindle has mounted on it a portion 2M of the roll which is freely rotatable on the spindle and can rotate relatively to the rear portion I99 of the roll when curved portions of work-pieces are being skived. The portion I99 of the roll and the rotatable portion 2! are between the block I85 and the depending locking-piece I89 and if the latter is removed the loose part of the roll or the complete roll may be readily removed merely by drawing them forwardly, such forward movement disconnecting the spindle IEI from the driving member I95. A presser roll which is differently shaped lengthwise may then be assembled with the block and the end piece secured thereto.

A guard 203 (Fig. 6) is provided which is secured to the machine frame, guards the lower portion of the knife edge, and prevents injury to the operator or damage to this portion of the knife edge when the aforesaid hinged end-portion is open. The guard comprises a strip of metal about half an inch wide. The strip extends about half-way around the lower portion of the knife and its forward end is secured to the inside of the machine frame.

The machine has a guard at the left-hand side of the feed and presser rolls, i. e., the side from which the work is presented by the operator to the rolls, which prevents the operators fingers from being caught between the rolls. This guard consists of a strip 205 (Fig. 4) which is secured by screws 201 to a bracket 289 which is secured on the hinged end-portion I9. The strip carries the edge gauge 43. The edge gauge is secured to the strip 205 by a screw 2I I which passes through an open-ended slot in the gauge and is threaded into the strip. A screw 2 I 3 threaded into the edge gauge has a head which engages in a vertical groove 2I5 in the strip so that if the screw 2!! is slackened the screw 2I3 may be adjusted to adjust the edge gauge 43 forwardly or rearwardly. The screw 2I3 is locked by a set screw 2 I i in the edge gauge and when the screw 2I I has been slackened' the edge gauge mayberemoved from the strip 205 and be replaced without lossof the adjustment setting of the screw 2'I'3 sincethis screw is rem'oved'with the edgegauge in its locked position, its head being, withdrawn from the" groove 2I5 when. the ed'gegauge'is removed and is replaced therein" when the edge gauge is replaced.

The machine is'provided' witha guard 21 9' (Fig. 5) for thebelt 48. The guard ZIB surrounds the lower portion of the belt 49 just above the fast and loose pulleys and'is secured to an arm 22I. fixed on. a bracket 2:23 which is secured to the work bench.

Having thus described our invention, what we claim as new anddesire to'secure by'LettersPatent of the Unitedstates is: 1. A skiving machine having in combination a tubular knife; afeed rol'l, aframe" anend-portion' of which carries the roll; said end-portion being mounted for swinging movement from closed to open position to'expose the knife, means for'ap plying power to"rotate the knife, and mean's'for' preventing opening of theen'd -p'ortion while power is being applied;

2. A skiving machine having in combination a tubular knife, a feed roll, a frame anend-portion of which carries. the roll, said end-portion being mounted" for swinging movement from closed to'open position. to expose the knife, means for applying power'to rotate thekn'ife, and means for preventingpower fromibeing'applied to rotate the knifewhen' the end-portion is in open" position.

3. A skiving machine having in combination a tubular knife, a feed roll, a frame an end-portion of which carries the roll, said end-portion being mounted for swinging movement from closed to open position to expose the knife, means including a belt shifter for applying power to rotate the knife, and means for preventing opening of the end-portion while the belt shifter is in position to apply power.

4. A skiving machine having in combination a tubular knife, a feed roll, a frame an end-portion of which carries the roll, said end-portion being mounted for swinging movement from closed to open position to expose the knife, means including a belt shifter for applying power to rotate the knife, and means for preventing the belt shifter from being operated to apply power when the end-portion is in open position.

5. A skiving machine having in combination a knife, a feed roll, means including a belt for rotating the roll, a guard for the belt, said guard being mounted for swinging movement from closed to open position to expose the belt, means for applying power to drive the belt, and means for preventing opening of the guard while power is being applied.

6. A skiving machine having in combination a knife, a feed roll, means including a belt for rotating the roll, a guard for the belt, said guard being mounted for swinging movement from. closed to open position to expose the belt, means for applying power to drive the belt, and means for preventing power from being applied to drive the belt while the guard is in open position.

7. A skiving machine having in combination a knife, 2. feed roll, means including a belt shifter for applying power to rotate the knife and roll, means including a belt for rotating the roll, a guard for said belt, said guard being mounted for swinging movement from closed to open position to expose the belt, and means for preventing opening of the guard while the belt shifter is in posiiton to apply power.

8. A skiving machine having in combination a knife, a feed roll, means including a belt shifter for applying power to rotate the knife and roll, means including a belt for rotating the roll, a guard for said belt, said guard being mounted for swinging movement from closed to open position to expose the belt, and means for preventing the belt shifter from being operated to apply power when the guard is in open position,

9. A skiving machine having in combination a tubular knife, a feed roll, a swinging frame for permitting the roll to yield bodily away from the knife, a feed-roll carrier mounted for endwise tilting movement on the frame, a spring-pressed plunger acting at all times to resist swinging of the frame, a second spring-pressed plunger acting to resist said swinging, adjusting means for predetermining the point in the swinging of the frame at which th second spring-pressed plunger becomes effective, yielding means acting at all times to resist the tilting of the roll, a second yielding means acting to resist said tilting, and a second adjusting means for redetermining the point in the tilting of the roll at which said second yielding means becomes effective.

10. A skiving machine having in combination a tubular knife, a feed roll having an annular groove, a yielding carrier for the roll in which the roll is mounted for yielding endwise-tilting movement, and a yielding finger pivoted to the roll carrier and extending into the groove.

11. A skiving machine having in combination a tubular knife, a feed roll, a presser roll, a frame in which these members are mounted, said frame being adapted to rest upon a bench, a bracket secured to the bench to the rear of the frame, a countershaft mounted in the bracket, means including belts for driving the knife and rolls from the countershaft, and a pivot connecting the countershaft bracket and the rear portion of the frame so that the frame may be swung up about the pivot.

12. A skiving machine having in combination a tubular knife, a feed roll, a presser, a guard in front of said roll and presser, and an edge gaug mounted on said guard.

13. A skiving machine having in combination a tubular knife, a feed roll, a presser, a guard in front of said roll and presser, and an edge gauge adjustably mounted on said guard.

14. A skiving machine having in combination a tubular knife, a feed roll, a presser roll including an idle section and a driven section, a spindle to which the driven section is fast and upon which the idle section is rotatable, a driving shaft having a separable connection with one end of the spindle, a block by which the roll is carried, and a locking-piece removably fastened to the block and having a bore to receive an end of the spindle which projects beyond one end of the idle section,

SYDNEY WHITE POTTER. JOSEPH HAROLD PERKINS. 

